package com.example.yunpicture.service.impl;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.yunpicture.constant.UserConstant;
import com.example.yunpicture.exception.BusinessException;
import com.example.yunpicture.exception.ErrorCode;
import com.example.yunpicture.model.dto.user.UserQueryRequest;
import com.example.yunpicture.model.entity.User;
import com.example.yunpicture.model.enums.UserRoleEnum;
import com.example.yunpicture.model.vo.LoginUserVO;
import com.example.yunpicture.model.vo.UserVO;
import com.example.yunpicture.model.vo.UserVO;
import com.example.yunpicture.service.UserService;
import com.example.yunpicture.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author LenoVO
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-02-12 10:01:17
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
        implements UserService {

    /**
     * 注册
     *
     * @param userAccount   账号
     * @param userPassword  密码
     * @param checkPassword 确认密码
     * @return id
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        //1.校验参数
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "有参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次密码输入不一致");
        }
        //2.检查用户账号是否和数据库中已有的重复
        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper();
        queryWrapper.eq(User::getUserAccount, userAccount);
        Long l = this.baseMapper.selectCount(queryWrapper);
        if (l > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        //3.密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        //4.插入数据到数据库中
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("用户---" + userAccount.substring(userAccount.length() - 4));
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean result = this.save(user);
        if (!result) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库异常");
        }
        return user.getId();
    }


    /**
     * 登录
     *
     * @param userAccount  账号
     * @param userPassword 密码
     * @param request      请求
     * @return userVO
     */

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.校验
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号错误");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码错误");
        }
        //2.密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        //3.查询用户是否存在
        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(User::getUserAccount, userAccount);
        queryWrapper.eq(User::getUserPassword, encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        if (user == null) {
            log.info("User login failed , userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }
        //4.记录用户登录状态
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE, user);
        return this.getLoginUserVO(user);
    }

    /**
     * 获取当前登录用户
     *
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        //判断是否登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    /**
     * 用户退出登录
     *
     * @param request
     * @return
     */
    @Override
    public boolean userLoginout(HttpServletRequest request) {
        //判断是否登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        if (userObj == null ) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"未登录");
        }
        //退出
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }

    /**
     * 加密算法
     *
     * @param userPassword 密码
     * @return 加密后的密码
     */

    @Override
    public String getEncryptPassword(String userPassword) {

        final String SALT = "hui";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    /**
     * 将user转化为loginuserVO脱敏
     *
     * @param user 用户
     * @return userVO
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO userVO = new LoginUserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 将user转化为userVO脱敏
     * @param user
     * @return
     */
    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 获取脱敏后的userVOlist
     * @param userList
     * @return
     */
    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if(CollUtil.isEmpty(userList)){
            return new ArrayList<>();
        }
        return userList.stream()
                .map(this::getUserVO)
                .collect(Collectors.toList());
    }

    /**
     * 获取查询条件
     * @param userQueryRequest
     * @return
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "user_role", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "user_account", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "user_name", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "user_profile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

}




